@mjd Sorry, you might have to reinstall or clear the app data. I ran into the same issue testing a change I made. There was a piece of code that was supposed to reset a bit of background data the first time this update runs, but it sounds like it didn't. And now it's trying to pass a new redirect URI with an old key it had saved, and they conflict.

@Tusky The "Visit website" link in #Tusky's Google Play page redirects to HTTP instance of your website, although you have HTTPS. Given you serve direct APK downloads, it's critical that you advertise it as HTTPS for as many people as possible. You could as well kill HTTP version altogether from Let's Encrypt certbot.